I am getting voltage to switch. Three wire switch. Unit has a one step system , operates from control box and or dash. I get a clicking sound from either the control box, sounds like or near awning motor. The awing is just under two years old. 9100 Dealer that installed said it gave him issue once , It worked nine out of ten times. I had to run a little 12 volt alarm battery to retract. Motor works well. One-step no longer available. Has a three wire switch. What is the center wire. I know the out side terminals are polarity + and - . Is the center a ground ?